Re: Asrock Z77 Extreme4 dead?? Maybe not?
The two regulators could (and likely do) have different resistor values for the adjust resistors. Also the way they are connected in the circuit and what they power could also have different static resistances (i.e. resistance when system is powered off).
Put one probe of your multimeter on one end/lead of that resistor and the other probe on the other end/lead of the resistor. A zero-Ohm resistor like that (i.e. "000", "0") should show whatever is the lowest resistance that your multimeter can show when your hold both probes connected on the lowest resistance scale. So if you connect your probes together on the lowest resistance scale and you get, say, 1.3 Ohms - then that's the lowest resistance your multimeter can measure and that 1.3 Ohms can pretty much be considered a short circuit.
That suggests that the "000" resistor is not connected to the output (tab) of the 1117 regulator. You should get something more like 0-3 Ohms (i.e. whatever is the lowest your multimeter can measure).
The reading you got might suggest it is connected to the input of the regulator, though. See if you get a short-circuit resistance to pin 3 (input) of the 1117 regulator.
Sometimes, what seems like a clear path for a trace to be going may not be the case. Yes, it looks like the "000" resistor is connected to the output of the cap, but maybe underneath the cap, it stops and goes through a via to some other layer. So in cases like that, you just have to rely on your multimeter to guide you and if necessary, also remove the cap to see what is going on under it.
I agree. This doesn't look like a cap issue indeed.
I was hoping that removing the "000" resistor would isolate the 1117 regulator and its filter cap from the rest of the circuit. But given the resistance measurements by the O/P, I guess that probably won't happen.
Originally posted by Uazzamerican
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Originally posted by Uazzamerican
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Originally posted by Uazzamerican
The reading you got might suggest it is connected to the input of the regulator, though. See if you get a short-circuit resistance to pin 3 (input) of the 1117 regulator.
Originally posted by Uazzamerican
Originally posted by jiroy
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I was hoping that removing the "000" resistor would isolate the 1117 regulator and its filter cap from the rest of the circuit. But given the resistance measurements by the O/P, I guess that probably won't happen.
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